[issue29172] blake2: Use lowest-common denominator signature of #pragma pack

[Martin Panter]

Martin Panter added the comment:

FWIW Issue 28290 was also opened about this pragma directive being not recognized by a compiler called xlC on AIX.

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nosy: +martin.panter

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29172>
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